Approaching theoretical maximum energy performance for desiccant dehumidification using staged and optimized metal-organic frameworks

Shahvari, Saba Zakeri; Clark, Jordan D.

doi:10.1016/j.apenergy.2022.120421

Cited by 7 publications

(1 citation statement)

References 76 publications

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“…23 The capability of modulating the relative humidity for pore condensation of M 5 X 4 (bibta) 3 also offers the possibility for designing a multistage dehumidification system. 24,25 Given the relatively fast kinetics for sorption, minimal hysteresis, and high capacity, it should be possible to design a multistage desiccant wheel system in which each stage in the system uptakes water at a progressively lower relative humidity. However, the cycling stability of the materials in the higher relative humidity regime must be improved.…”

Section: Andmentioning

confidence: 99%

Tunable Low–Relative Humidity and High–Capacity Water Adsorption in a Bibenzotriazole Metal–Organic Framework

Alezi,

Oppenheim,

Sarver

et al. 2023

J. Am. Chem. Soc.

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Materials capable of selectively adsorbing or releasing water can enable valuable applications ranging from efficient humidity and temperature control to the direct atmospheric capture of potable water. Despite recent progress in employing metal−organic frameworks (MOFs) as privileged water sorbents, developing a readily accessible, water-stable MOF platform that can be systematically modified for high water uptake at low relative humidity remains a significant challenge. We herein report the development of a tunable MOF that efficiently captures atmospheric water (up to 0.78 g water/g MOF) across a range of uptake humidity (27−45%) employing a readily accessible Zn bibenzotriazolate MOF, CFA-1 ([Zn 5 (OAc) , as a base for subsequent diversification. Controlling the metal identity (zinc, nickel) and coordinating nonstructural anion (acetate, chloride) via postsynthetic exchange modulates the relative humidity of uptake, facilitating the use of a single MOF scaffold for a diverse range of potential water sorption applications. We further present a fundamental theory dictating how continuous variation of the pore environment affects the relative humidity of uptake. Exchange of substituents preserves capacity for water sorption, increases hydrolytic stability (with 5.7% loss in working capacity over 450 water adsorption−desorption cycles for the nickel-chloride-rich framework), and enables continuous modulation for the relative humidity of pore condensation. This combination of stability and tunability within a synthetically accessible framework renders Ni-incorporated M 5 X 4 bibta 3 promising materials for practical water sorption applications.

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Section: Andmentioning

confidence: 99%

Tunable Low–Relative Humidity and High–Capacity Water Adsorption in a Bibenzotriazole Metal–Organic Framework

Alezi,

Oppenheim,

Sarver

et al. 2023

J. Am. Chem. Soc.

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Water Adsorption in MOFs: Structures and Applications

Zhang

Zhu

Wang

et al. 2023

Adv Funct Materials

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Metal–organic frameworks (MOFs) are superior sorbents for water adsorption‐based applications. The unique step‐like water isotherm at a MOF‐specific relative pressure allows easy loading and regeneration over a small range of temperature and pressure conditions. With good hydrothermal stability and cyclic durability, it stands out over classical sorbents used in applications for humidity control, water harvesting, and adsorption‐based heating and cooling. These are easily regenerated at moderate temperatures using “waste” heat or solar heating. The isotherm thermodynamics and adsorption mechanisms are described, and the presence of MOFs in the water–air system is explained. Based on six selection criteria ≈40 reported MOFs and one COF are identified for potential application. Trends and approaches in further synthesis optimization and production scale‐up are highlighted. No‐MOF‐fits‐all, each MOF has its own specific step location matching only with a certain application type. Most applications are technically feasible and demonstrated on the bench‐scale or small pilot. Their maturity is benchmarked by their technology readiness level. Retrofitting existing applications with MOFs replacing classical desiccants may lead to rapid demonstration. Studies on techno‐economic analysis and life cycle analysis are required for a rational evaluation of the feasibility of promising applications.

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Comparative study of Metal-Organic frameworks (MOFs) for indoor moisture control

Ding,

Qin

2024

Applied Thermal Engineering

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Approaching theoretical maximum energy performance for desiccant dehumidification using staged and optimized metal-organic frameworks

Cited by 7 publications

References 76 publications

Tunable Low–Relative Humidity and High–Capacity Water Adsorption in a Bibenzotriazole Metal–Organic Framework

Tunable Low–Relative Humidity and High–Capacity Water Adsorption in a Bibenzotriazole Metal–Organic Framework

Water Adsorption in MOFs: Structures and Applications

Comparative study of Metal-Organic frameworks (MOFs) for indoor moisture control

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